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        <title>RTCPeerConnection Demo | Muaz Khan</title>
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        <article> 
            <header style="text-align: center;">
                <h1>
                    RTCPeerConnection Simple Demo
                </h1>            
                <p>
                    <a href="https://www.webrtc-experiment.com/">HOME</a>
                    <span> &copy; </span>
                    <a href="http://www.MuazKhan.com/" target="_blank">Muaz Khan</a>
                    
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            <div class="github-stargazers"></div>

            <blockquote style="background: #f3b7b7;border: 5px solid black;border-radius: 5px;">
                This demo is <span style="border: 1px dotted red; background: yellow; padding: 2px 5px;">out-dated (published on 2013)</span>. Please try a LIVE demo here instead: <a href="https://webrtc.github.io/samples/src/content/peerconnection/pc1/">https://webrtc.github.io/samples/src/content/peerconnection/pc1/</a>
                <br><br>
                In case if above link gets broken: <a href="https://github.com/webrtc/samples">https://github.com/webrtc/samples</a>
            </blockquote>
        
            <div style="text-align:center;">
                <div class="videos-container">
                    <video id="peer2-to-peer1" autoplay controls></video>
                     <h2>Offerer-to-Answerer</h2>

                </div>
                <div class="videos-container">
                    <video id="peer1-to-peer2" autoplay controls></video>
                     <h2>Answerer-to-Offerer</h2>

                </div>
            </div>
			<script>
				 var mediaConstraints = {
					optional: [],
					mandatory: {
						OfferToReceiveAudio: true,
						OfferToReceiveVideo: true
					}
				};
			</script>
            <script>
                var offerer, answerer;
                var offererToAnswerer = document.getElementById('peer1-to-peer2');
                var answererToOfferer = document.getElementById('peer2-to-peer1');

                window.RTCPeerConnection = window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
                window.RTCSessionDescription = window.mozRTCSessionDescription || window.RTCSessionDescription;
                window.RTCIceCandidate = window.mozRTCIceCandidate || window.RTCIceCandidate;

                navigator.getUserMedia = navigator.mozGetUserMedia || navigator.webkitGetUserMedia;
                window.URL = window.webkitURL || window.URL;

                window.iceServers = {
                    iceServers: [{
                            url: 'stun:23.21.150.121'
                        }
                    ]
                };
            </script>
            <script>
                /* offerer */

                function offererPeer(video_stream) {
                    offerer = new RTCPeerConnection(window.iceServers);
                    offerer.addStream(video_stream);

                    offerer.onaddstream = function (event) {
                        offererToAnswerer.src = URL.createObjectURL(event.stream);
                        offererToAnswerer.play();
                    };

                    offerer.onicecandidate = function (event) {
                        if (!event || !event.candidate) return;
                        answerer.addIceCandidate(event.candidate);
                    };

                    offerer.createOffer(function (offer) {
                        offerer.setLocalDescription(offer);
                        answererPeer(offer, video_stream);
                    }, function() {}, mediaConstraints);
                }
            </script>
            <script>
                /* answerer */

                function answererPeer(offer, video_stream) {
                    answerer = new RTCPeerConnection(window.iceServers);
                    answerer.addStream(video_stream);

                    answerer.onaddstream = function (event) {
                        answererToOfferer.src = URL.createObjectURL(event.stream);
                        answererToOfferer.play();
                    };

                    answerer.onicecandidate = function (event) {
                        if (!event || !event.candidate) return;
                        offerer.addIceCandidate(event.candidate);
                    };

                    answerer.setRemoteDescription(offer);
                    answerer.createAnswer(function (answer) {
                        answerer.setLocalDescription(answer);
                        offerer.setRemoteDescription(answer);
                    }, function() {}, mediaConstraints);
                }
            </script>
            <script>
                var video_constraints = {
                    mandatory: {},
                    optional: []
                };

                function getUserMedia(callback) {
                    var n = navigator;
                    n.getMedia = n.webkitGetUserMedia || n.mozGetUserMedia;
                    n.getMedia({
                        audio: true,
                        video: video_constraints
                    }, callback, onerror);

                    function onerror(e) {
						alert(JSON.stringify(e, null, '\t'));
                    }
                }
            </script>
            <script>
                getUserMedia(function (video_stream) {
                    offererPeer(video_stream);
                });
            </script>

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                <h2 id="feedback" style="padding: .2em .4em; border-bottom: 1px solid rgb(189, 189, 189);">Feedback</h2>
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            <section class="experiment own-widgets latest-commits">
                <h2 class="header" id="updates" style="color: red; padding-bottom: .1em;"><a href="https://github.com/muaz-khan/WebRTC-Experiment/commits/master" target="_blank">Latest Updates</a></h2>
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